Process oe hrobtj cim g- dbhybbateb mineral salts



L..D00NAR. I PROCESS OF PRODUCING DEHYDRATEDl MINERAL SALTS.

APPLICATION FILED DEC. 27.1917.

' Patented. Jfulyl, 1919.

Arabi xz. SEXE QMPL WU. w 04CP L B Armen/n To all whom it may concernirn srnriis PATENT onirica i Louis nooNn .or nenn, onneoiv.

Specification of Letters Patent.

' PROCESS 0F PROllTUUING DEHYDRATED MINERAL SALTS.

Application led December 27, 191'?. Serial No. 209,153.

Be it known that l, Louis lDooNAn, a citizen of the United States, and aresident of lBend, in the county of Deschutes and State of UregOn, haveinvented a new and useful llmprovement in Processes of ProducingDehydrated Mineral Salts, of which the fol-- lowing `is a specication.

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such salts as sodium carbonate.

A further object of my invention is to provide a-process which iscontinuous, that is to say, one in which the material may be `constantlyfed in at one end of the apparatus and is delivered at the other end ofthe apparatus ina water-free or anhydrous condition.

A further ob] ect of my invention 1s to provide a process for extractingwater from salts, by means of which the operation ,is accomplished in aminimum of time.

Other objects and advantages will appear in the following specication,and thenovel features of the invention will be particularly pointed outin the appended claims.-

ltfy invention is illustrated in the accompanying drawing, which is adiagrammatic view of the apparatus used in the process.

ln carrying out my invention, sodium carbonateor other salt from whichthe water is to be removed, is rst dissolved in water to the point ofsaturation at the ordinary boiling point of water. I'llhis is done 1n amix# ing tank, such as that shown at l in the -drawing I"llhe solutionis then passed through a lter 2, where it is ltered, and then isconducted to an evaporator where the solution is brought to its highestpoint of saturation. l v

l"flic solution is now pumped means of the pump A' into a' superheatingpressure tanlr 5, where it is heated within a few degrecs of its boilingpoint. llt will be under-A stood that the pressure in this pressure tankis far above the atmospheric pressure, so vthat the solution which hasnot quite attained its boiling point in the heating tank 5, is in fact,far beyond its boiling point at atmospheric pressure. Passing out of thesuperheating pressure tank 5, the liquid is atomized at 6, by means ofsteam or hot air. rllhe steam may be generated by a boiler 7, vitstemperature increased by a superheater 8, after which it passes througha pipe to the atomizer 6, so that the atomized solution is injected intoa hot mixing chamber 9, From the mixing chamber 9, the atomized solutionis conducted to a separator 10. In the drawing, l have shown thisseparator as consisting of a vertically extending pipe 11 disposedwithin the separator beneath a screen l2. The latter may be of cloth'`or other material of. ne mesh. Heatingcoils 13 are disposed within theseparator 10, the idea being to maintain the temperature ofthe v steamso that the latter is in a dry state. The

dry steam passes out through an exit pipe 1A, but the dry salt isprecipitated 4upon the inclined bottoms 15 of the separator, and maypass outwardly through the pipes or chutes le.

Patented July l, i919. A

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`v lt will be observed-that the main features of the invention 'consistin atomizing a concentrated solution of the salt and maintain- -ing ahigh temperature so that the water in rthe salt which includes the waterof crystallization, is changed into steam which is in a dry state, andthen separating the salt from the steam.

"MA ile lf have shown a boiler and a superheater for the steam, it isobvious that hot air may be used and may be kept at such a temperaturethat the water contained in the salt is maintained in a state of drysteam until the separation has been edected.

Ylhe apparatus disclosed in the present ap plication forms no part ofthe present invention. Any means for artomizing` a concentrated solutionand for maintaining a high temperature while separating the dry steamfrom the dry salt might be used with out departing from the spirit ofthe invention.

rlhe product which is turned out by the herein described process is ofgreat purity,l

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l. The hereindescribed process of prot ducing dehydrated mineral salts,which consists in providing a hot, saturated solution of the salt,'superheating the solution under pressure, to a point just below theboiling lllltl point of the solution at the pressure to which it issubjected, atomizing the superheatedv solution by means of a hot gas,and maintaining the atomzed solutlon and gas at a temperature sufficientto keep all the moisture of the salt in a state of dry steam, and

separating the dry salt from the dry steam.

2. The herein described process of producing dehydrated mineral salts,which con# of .dry steam, and separating the dry sal from the dry steam.

3. The herein described process of producing dehydrated mineral salts,which oon- "sists in preparing a saturated solution ofthe salt, heatingthe solution under pressure, atomizing the heated solution by means. ofa hot gas, and maintainingthe atomzed solution and gas at a temperaturesucient to keep all the moisture of the salt in a state of dry steam,and separating the dry salt from the dry steam.

4. The herein described process ofproducing a dehydrated salt whichconsists in first preparing a saturated solution of the salt in Water,heating the solution under pressure, atolnizing the heated solution bymeans of a hot gas, andV maintaining the atomized solution and gas at atemperature suiiicient to keep all of the moisture of thc salt in astate of 4dry steam, and separating the dry -salt from the dry steam.`

5. The herein described process of removing the Water of crystallizationfrom. a mineral salt which consists in mixing the salt with Water untila concentrated solution is obtained, heating the solution, atomizing theheated solution, and maintainin the atomized solution at a temperaturesu cient tofkeep all the moisture of the salt in a kstate of dry steam,and separating the dry salt ron the dry steam.

LOUIS DOONAR.

Witnesses:

M. E. COLEMAN, H. C. ELLIS.

